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His consultant hopes he can live for another 18 years. Turnbull's interview comes after Stephen Fry revealed he recently underwent surgery for the disease.

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In the UK prostate cancer is the most common cancer in men and the risk of developing it increases with age.

This illustration shows the prostate gland

What are the symptoms?

* Needing to urinate more often including at night

* Difficulty urinating

* Straining or taking a long time to finish urinating

* A weak flow

* A feeling that you are not fully emptying your bladder

* Needing to rush to urinate or dribbling urine after you finish

* Less common symptoms

* Pain when urinating or ejaculating

* Blood in the urine or semen

* Erection problems

The PSA test is used to detect prostate cancer

What is a PSA test?

It’s a blood test that measures the amount of prostate specific antigen in your blood. PSA is a protein produced by normal cells in the prostate and also by prostate cancer cells. It’s normal for men to have a small amount of PSA in their blood and the amount rises as you get older.

A sample of your blood is taken and sent for analysis. The amount of PSA in your blood is measured in nanograms per millilitre of blood. Urine infections, vigorous exercise or sex can all affect readings.